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WO1997007958A2 - Unite de moulage par injection pour machine de moulage par injection de matieres plastiques - Google Patents

Unite de moulage par injection pour machine de moulage par injection de matieres plastiques Download PDF

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Publication number
WO1997007958A2
WO1997007958A2 PCT/DE1996/001533 DE9601533W WO9707958A2 WO 1997007958 A2 WO1997007958 A2 WO 1997007958A2 DE 9601533 W DE9601533 W DE 9601533W WO 9707958 A2 WO9707958 A2 WO 9707958A2
Authority
WO
WIPO (PCT)
Prior art keywords
injection molding
assembly
molding unit
drive
unit according
Prior art date
Application number
PCT/DE1996/001533
Other languages
German (de)
English (en)
Other versions
WO1997007958A3 (fr
Inventor
Karl Hehl
Original Assignee
Karl Hehl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE1995131335 external-priority patent/DE19531335C2/de
Priority claimed from DE19542453A external-priority patent/DE19542453C2/de
Application filed by Karl Hehl filed Critical Karl Hehl
Publication of WO1997007958A2 publication Critical patent/WO1997007958A2/fr
Publication of WO1997007958A3 publication Critical patent/WO1997007958A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/03—Injection moulding apparatus
    • B29C45/07—Injection moulding apparatus using movable injection units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • B29C2045/5084—Drive means therefor screws axially driven by roller elements

Definitions

  • the invention relates to an injection molding unit for a plastic injection molding machine for processing plastifiable masses, such as plastics, powdery and ceramic masses according to the preamble of claim 1.
  • Such an injection molding unit is known from EP-A 576 925, in which a carrier block is mounted on the stationary mold carrier via bars. The bars are replaced in places by electromechanical spindle drives, which comprise a drive unit for applying the nozzle to the injection mold and an injection unit, which generates the axial movement of the screw conveyor within the plasticizing cylinder during injection.
  • a rotary motor for rotating the screw conveyor is also provided on an injection bridge.
  • the units arranged one behind the other are arranged symmetrically to the injection axis so that a symmetrical introduction of force results, but the serial arrangement leads on the one hand to a large overall length of the injection molding unit and on the other hand the functionality of the injection unit and Drive unit can only be tested when assembled. If a unit is defective, it is also necessary to dismantle at least one ' ' spar '' with both units, so that unnecessary additional work and additional costs result.
  • the present invention is based on the object of developing an injection molding unit of the type mentioned at the outset in such a way that the most economical and inexpensive modular structure is possible.
  • Fig. 1 is a partially sectioned plan view of a
  • FIG. 2 shows a side view of the injection molding unit according to FIG.
  • FIG. 3 is a view of the injection molding unit according to FIG. 1 from the right
  • FIG. 4 shows a section along line 4-4 of FIG. 1
  • FIG. 5 shows a top view of an injection molding unit in a second exemplary embodiment in a representation according to FIG
  • FIG. 6 is a side view of the injection molding unit shown in FIG. 5,
  • Fi g. 7 shows a view of the injection molding unit according to FIG. 5 from the right
  • Fig. 8 shows a section through the injection molding unit along the line
  • Fig. 9 shows a side view of an injection molding unit in a third exemplary embodiment
  • Fig. 10 shows a side view of an injection molding unit in a fourth exemplary embodiment
  • Fig. 11 shows a plan view of an injection molding unit in a fifth exemplary embodiment, compared with the second
  • FIG. 12 shows a side view of the injection molding unit according to FIG. 11
  • FIG. 13 shows a view of the injection molding unit according to FIG. 11 from the right
  • FIG. 14 shows a section through the injection molding unit along the line
  • the exemplary embodiments have in common that the injection molding units are used for metering and injecting plasticized material such as plastics, powdery materials and ceramic materials into a mold cavity 80 of a mold M.
  • the mold M lies at least in part on a stationary mold carrier 35 of the mold clamping unit on. With a nozzle D, the injection molding unit lies against the mold M during injection.
  • the injection molding unit has a carrier block 10, by means of which it is essentially supported on a machine frame 81.
  • the support takes place with the interposition of two strips 62 which have guide rails 19 on their upper side.
  • the carrier block 10 is supported on the guide rails by means of guide shoes 79 and can be moved toward and away from the stationary mold carrier 35 by first drives 100. Nevertheless, the injection molding unit as a self-contained assembly can be moved independently of the machine base and can e.g. for injection into the parting plane of the form M, if necessary together with the strips 62.
  • the injection molding unit comprises a plasticizing unit 17, which supplies plasticized material to the mold cavity 80 of the mold M via a nozzle in an injection axis s-s.
  • a conveying means 72 which is either a conveying piston or a conveying screw, is received in the plasticizing unit.
  • a rotary motor 52 is provided as the metering drive.
  • the plasticizing unit 17 is detachably received by the carrier block 10.
  • the first assembly A is formed by a plurality of electromechanical first drives 100 which act symmetrically on the spray axis ss on the carrier block 10. They cause a relative movement of the carrier block 10 with respect to the stationary mold carrier 35, in order to thereby axially shift the injection molding unit so that the nozzle D is placed against the mold M.
  • a plurality of electromechanical second drives 200 are provided as the second assembly group B. When it is actuated, there is a relative movement of the conveying means 72 with respect to the plasticizing unit 17, that is to say an axial movement of the conveying means in the plasticizing cylinder 36.
  • the third assembly C is the metering drive for rotating the conveying means 72 designed as a conveying screw.
  • the first drives 100 are mounted in further bores 10d of the support block 10 which are symmetrical to the spray axis ss.
  • the second drives 200 are also mounted in bores 10e arranged symmetrically to the spray axis ss, so that both drives bring their forces symmetrically into the injection molding unit. Since, according to FIGS. 3 and 4, the modules A, B can each be inserted as a structural unit into the bores, the modules can each be tested in advance and complex assembly work is largely eliminated.
  • the forces within the second assembly B and the third assembly C are roughly approximate in a ratio of 2: 1, there is the possibility of designing at least the two drive motors 51 of the first assembly B and the rotary motor 52 of the third assembly C to be of identical construction, since the forces are comparable in this division.
  • the gears 51a, 26 can preferably be of identical construction as planetary gears.
  • the drive motors 73 of the first assembly A can also be e.g. can be combined into an identical drive motor by connection via a gear, belt, etc. The manufacturer therefore only has to keep one assembly which can be installed in the injection molding unit at the required location without any problems.
  • the drives 100, 200 as well as the metering drive form the structural unit together with the respective drive motors 51, 73 or with the rotary motor 52.
  • a compact embodiment can be achieved in that the drive of one or more of the assemblies A, B, C as drive motor 51, 73 or rotary motor 52 has a hollow shaft motor, preferably with an integrated planetary gear. The additional costs for almost one motor per drive take a back seat due to the modular structure and the multiple usability of these motors, since the costs per motor decrease with increased quantities.
  • Fig. 4 illustrates the structure.
  • the spindle 18 is in the gear 51a of the drive motor 51 designed as a planetary gear the second assembly B stored.
  • the drive motor 51 can be controlled via linear potentiometers, not shown in the drawing, in such a way that synchronous operation between the two linked motors results. In this case, one side is preferably actively regulated with regard to its movement, while the other side runs passively.
  • the gear 51a includes a sun gear 74, which is also the rotor. Via a pinion area 74a, the sun gear drives the planet gear 75, which in turn is connected to the ring gear 76.
  • the gears 51a, 26, 73a designed as integrated planetary gears enable the use of larger spindles, which is equivalent to a longer service life of the drive. At the same time, a larger pitch can be achieved on the spindles, so that there is an optimization in that the torque can be set relatively high and the speed can be reduced at the same time. This contributes to increasing the service life.
  • FIG. 2 in conjunction with FIG. 1 illustrates that the spindles 18, 31 of the first assembly A and the second assembly B penetrate the carrier block 10.
  • the drive motors 51, 73 are located on opposite sides of the carrier block.
  • the plasticizing unit with the larger drive motors 51 of the second assembly B is thus arranged on one side, while the rotary motor 52, which is identical in construction with the drive motor 51, is arranged on the opposite side.
  • the injection bridge and the smaller drive motors 73 of the first assembly A are also located on this side. This structure alone can reduce vibrations occurring on a cyclically operating machine.
  • the entire structure in the first embodiment is somewhat wider than, for example, in the second embodiment. This is essentially due to the fact that the first drive 100 of the first assembly A is arranged on the outside, while in the same horizontal plane hh spars 33 come to rest. These spars 33 are at the stationary När shaped support 35 fastened by means of mounting plates 27. At their opposite end the spars 33 end at stops 33c. Both carrier block 10 and injection bridge 25 are guided on the spars by means of slide bearings 33a and 33b. 1 in the direction of the stationary mold carrier in front of the carrier block there is a support bracket 85 as a support element.
  • this bracket Since the support relative to the stationary mold carrier takes place via the bars 33, this bracket is necessary in order to connect the injection molding unit and in particular the first drives 100 of the first assembly A to the stationary mold carrier.
  • the support bracket lies against the strips 62 with contact surfaces 85a. From there, it merges via external supports 85b into flanges 85c lying in the level hh, which are penetrated by the spindles 31 and the spars 33.
  • the spars 33 are fixedly connected to the support bracket 85 and serve the first drives 100 as a stationary abutment in the direction of movement.
  • the nut 22 of the first drive 100 which cooperates with the spindle 31, is mounted in the support bracket 85 itself. The path of the support block 10 relative to the support bracket 85 is limited by the stop 32.
  • the spindle 31 of the drive motor 73 is mounted on the support block 10 via bearings 20.
  • the support element increases the service life of the injection molding unit and facilitates moving the injection molding unit, for example for injection into the parting plane of the mold.
  • Carrier block 10 and injection bridge 25 have wing areas 10b and 25c, in which the second drives 200 of the second assembly B are mounted. 3, 4, the drives 200 lie in a plane ff which is inclined with respect to the horizontal and contains the spray axis ss.
  • the spindle 18 of the drive motor 51 is mounted on the carrier block via bearings 23.
  • a nut 11 of the spindle drive is arranged in a rotationally fixed manner on the injection bridge 25, so that the desired axial movement of the injection bridge 25 results when the spindle 18 rotates.
  • the movement of the injection bridge 25 is limited by the stop 63, which is on rear end of the spindle 18 is located.
  • spindle and nut of the spindle drives can be replaced in all exemplary embodiments with regard to their arrangement.
  • the function of the spindle and nut can be reversed by - if necessary with the interposition of rolling or rolling elements - a tubular, external long part is used as a 'spindle' with an inner profile, into which a short spindle head as a 'nut' with an outer profile is immersed . This protects the drive from external influences in the simplest way.
  • FIGS. 5 to 8 differs from this first embodiment of FIGS. 1 to 4 in that the support bracket 85 is replaced by a support flange 86 which is fixedly connected to the bars 33. 7 and 8, the arrangement of the spars and spindles is changed to each other. Only the spars 33 are now found in the horizontal plane hh.
  • the drives 100 of the first assembly A on the other hand, like the second drives 200 of the second assembly B, lie in planes ee and ff inclined to the horizontal and in wing regions 10b, 10c of the support block 10
  • the narrower construction gives space on the side for other aids, such as Power transmission elements between mold closing unit and injection molding unit.
  • the third exemplary embodiment in FIG. 9 shows a modified motor arrangement.
  • the nut 11 of the second drive 200 of the second assembly B is arranged on the support block 10, while the spindle 18 is fastened to the injection bridge 25 via bearings 23, 23a.
  • a drive motor 73 designed as a hollow shaft motor with a spindle nut 78 is provided for placing the nozzle D against the form M, it being possible to use a planetary gear as the gear 73a.
  • an intermediate piece 13 is used, which is installed here between carrier block 10 and drive motor 73. When reversing from The spindle and nut can also be attached to the stationary mold carrier 35 here.
  • the interchangeable intermediate pieces 13 in FIG. 9 lie in the axis of the spindle 31.
  • the intermediate pieces 13 form at least the part of the spar into which the spindles 31 of the first drive 100 are immersed or which they penetrate.
  • the spindle 31 is mounted on a support plate 87 which is connected to the strips 62.
  • a stop 32 can slide on the inside of the intermediate pieces 13.
  • the intermediate pieces 13 are usually delivered in the shortest embodiment when delivered to the customer.
  • the length / diameter ratio of the conveying means 72 can be changed by exchanging the intermediate pieces 13 for longer ones or by stringing together intermediate pieces 13 while extending the plasticizing cylinder can be achieved.
  • the rotary motor 52 is arranged transversely to the spray axis ss, more precisely projecting upwards. This leads to a shortening of the injection molding unit and contributes to a center of gravity.
  • a favorable speed / torque characteristic for the conveying means 72 can be achieved via a gear 26, preferably a bevel gear.
  • the spindle 31 of the first assembly A is extended. As a stable guide element, it has a guide region 31a for guiding the carrier block 10 by means of slide bearings 33a and the injection bridge 25 by means of slide bearings 33b. Because of the guidance, the injection bridge 25 is no longer supported on the guide rail 19.
  • the drives 200 of the second Module B are arranged in a plane inclined to the horizontal.
  • the spindle 31 is not only connected to the strips via a support plate 87 as in the previous exemplary embodiment.
  • a support plate 82 is provided at the rear end of the bar, which supports the guide region 31a of the spindle 31. This ensures stable storage, prevents the injection molding unit from tipping over in the rear area and counteracts vibrations that counteract the life of the entire unit. This stability also facilitates the movement of the entire injection molding unit as a structural unit, e.g. for injection into the parting line.
  • the fifth exemplary embodiment of FIGS. 11-14 largely corresponds to the second exemplary embodiment of FIGS. 5-8. Only the first drive 100 and drive motor 73 of the first assembly were arranged in reverse, so that the spindles 31 of the first assembly, like the spindles 18 of the second assembly, point away from the stationary mold carrier.
  • the gear 73a of the drive motor 73 is mounted on the support flange 86 and drives the spindle 31.
  • the associated spindle nut 22 itself is non-rotatably on the carrier block 10.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne une unité de moulage par injection utilisée pour travailler des substances plastifiables. Cette unité de moulage par injection comprend un premier ensemble (A) constitué de plusieurs premiers dispositifs d'entraînement électromécaniques (100) qui sont en contact avec un bloc de support (10), de façon symétrique par rapport à l'axe d'injection (s-s). Un second ensemble (B) est constitué de plusieurs seconds dispositifs d'entraînement électromécaniques (200) disposés symétriquement par rapport à l'axe d'injection (s-s) et servant à déplacer un moyen de transport par rapport à l'unité de plastification (17). Les premiers dispositifs d'entraînement (100) et les seconds dispositifs d'entraînement (200) sont montés dans des alésages du bloc de support (10) qui s'étendent symétriquement par rapport à l'axe d'injection (s-s). Chacun des ensembles (A-B) peut être introduit en tant qu'unité dans ces alésages.
PCT/DE1996/001533 1995-08-25 1996-08-13 Unite de moulage par injection pour machine de moulage par injection de matieres plastiques WO1997007958A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE1995131335 DE19531335C2 (de) 1995-08-25 1995-08-25 Spritzgießeinheit für eine Spritzgießmaschine
DE19531335.6 1995-08-25
DE19542453A DE19542453C2 (de) 1995-11-14 1995-11-14 Vorrichtung zur Umwandlung einer Drehbewegung in eine Axialbewegung
DE19542453.0 1995-11-14

Publications (2)

Publication Number Publication Date
WO1997007958A2 true WO1997007958A2 (fr) 1997-03-06
WO1997007958A3 WO1997007958A3 (fr) 1997-03-27

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PCT/DE1996/001533 WO1997007958A2 (fr) 1995-08-25 1996-08-13 Unite de moulage par injection pour machine de moulage par injection de matieres plastiques

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB965214A (en) * 1960-01-18 1964-07-29 Projectile And Engineering Com Improvements in or relating to injection moulding machines
CH577376A5 (en) * 1974-11-26 1976-07-15 Netstal Ag Maschf Giesserei Plastics injection moulding machine - having hydraulically operated plasticising injection screw driving shaft, pistons-cylinders and guide beams
EP0316561A1 (fr) * 1987-10-20 1989-05-24 Karl Hehl Unité pour mouler par injection de la matière plastique
EP0427866A1 (fr) * 1989-05-24 1991-05-22 Fanuc Ltd. Dispositif d'injection du type a deux plaques
EP0576925A1 (fr) * 1992-06-23 1994-01-05 Battenfeld Kunststoffmaschinen Ges.m.b.H. Unité d'injection pour machines à mouler par injection
EP0581401A1 (fr) * 1992-07-17 1994-02-02 MANNESMANN Aktiengesellschaft Machine à mouler par injection
EP0627289A1 (fr) * 1993-05-29 1994-12-07 Karl Hehl Unité d'injection pour machine d'injection de matières plastiques
DE4344335A1 (de) * 1993-12-23 1995-06-29 Krauss Maffei Ag Einspritzaggregat für eine Spritzgießmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0669705B2 (ja) * 1990-11-28 1994-09-07 日精樹脂工業株式会社 電動式竪型射出成形機

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB965214A (en) * 1960-01-18 1964-07-29 Projectile And Engineering Com Improvements in or relating to injection moulding machines
CH577376A5 (en) * 1974-11-26 1976-07-15 Netstal Ag Maschf Giesserei Plastics injection moulding machine - having hydraulically operated plasticising injection screw driving shaft, pistons-cylinders and guide beams
EP0316561A1 (fr) * 1987-10-20 1989-05-24 Karl Hehl Unité pour mouler par injection de la matière plastique
EP0427866A1 (fr) * 1989-05-24 1991-05-22 Fanuc Ltd. Dispositif d'injection du type a deux plaques
EP0576925A1 (fr) * 1992-06-23 1994-01-05 Battenfeld Kunststoffmaschinen Ges.m.b.H. Unité d'injection pour machines à mouler par injection
EP0581401A1 (fr) * 1992-07-17 1994-02-02 MANNESMANN Aktiengesellschaft Machine à mouler par injection
EP0627289A1 (fr) * 1993-05-29 1994-12-07 Karl Hehl Unité d'injection pour machine d'injection de matières plastiques
DE4344335A1 (de) * 1993-12-23 1995-06-29 Krauss Maffei Ag Einspritzaggregat für eine Spritzgießmaschine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MODERN PLASTICS INTERNATIONAL, Bd. 21, Nr. 5, 1.Mai 1991, Seiten 48-50, XP000229164 MAPLESTON P: "HYBRID INJECTION MACHINES (HYDRAULIC AND SERVO-ELECTRIC DRIVES) MULTIPLY" *
PATENT ABSTRACTS OF JAPAN vol. 016, no. 523 (M-1331), 27.Oktober 1992 & JP 04 193515 A (NISSEI PLASTICS IND CO), 13.Juli 1992, *

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Publication number Publication date
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